to think that Christmas calories don't count?

I have always assumed that we are granted immunity from calories consumed on Christmas day, meaning I can start to fantasize over my Christmas day glutton list, safe in the knowledge it won't in any way shape or form derail my constant dieting. Am I being unreasonable?

Just think of all the extra exercise you're doing with your mouth to eat Christmas dinner. That's not to mention lifting the turkey out if the oven, squats to look through the oven door and every mouthful is effectively a bicep curl. If you didn't eat more you'd be in danger of passing out.